NCERT Class 5 Mathematics Math-Magic: Chapter 11 — cm
This chapter, "Whose Slice is Bigger?" from NCERT's Class 5 Mathematics Math-Magic book, introduces the concept of area and how to compare the sizes of rectangular shapes. It begins with a relatable scenario of two friends, Parth and Gini, trying to determine whose dried mango slice (aam paapad) is bigger. The chapter guides students to explore methods for comparison, including using small squares to measure area. It demonstrates how to calculate the area of a rectangle by multiplying its length and width, measured in centimeters. Students are encouraged to practice calculating the area of different rectangular pieces and determine which is larger. The chapter also touches upon comparing areas using stamps, reinforcing the idea of covering a surface. This foundational understanding of area is crucial for future mathematical concepts in the CBSE curriculum.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 5 |
| Subject | Mathematics |
| Book | Math-Magic |
| Chapter | Chapter 11 — cm |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 2 minutes |
| Word count | 249 |
Learning outcomes
- Understand the concept of area as the space occupied by a 2D shape.
- Compare the areas of rectangular shapes.
- Calculate the area of a rectangle by multiplying its length and width.
- Apply the concept of area to solve simple problems.
- Develop strategies for measuring and comparing areas.
Vocabulary
| Word | Meaning |
|---|---|
| Area | The amount of space a two-dimensional shape covers. |
| Boundary | The outer edge or limit of a shape. |
| Slice | A piece cut from a larger portion of food. |
| Square cm | A unit of area equal to the area of a square with sides of 1 cm. |
| Rectangle | A four-sided shape with four right angles. |
| Length | The measurement of how long something is. |
| Width | The measurement of how wide something is. |
| Stamp | A small piece of paper with a design, used for decoration or postage. |
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Practice questions
- Parth's dried mango slice (Piece A) has a length of 6 cm and a width of 5 cm. How many squares of 1 cm side can be arranged on it? Answer: 30 squares
- Calculate the area of Piece A in square cm. Answer: 30 square cm
- If Piece B has an area of 28 square cm, which piece is bigger and by how much? Answer: Piece A is bigger by 2 square cm (30 - 28 = 2).
- A rectangle has a length of 10 cm and a width of 4 cm. What is its area? Answer: 40 square cm
Frequently asked questions
What is the main concept introduced in NCERT Class 5 Mathematics Chapter 6?
The chapter introduces the concept of area and how to compare the sizes of rectangular shapes.
How can we find the area of a rectangle?
The area of a rectangle can be found by multiplying its length by its width.
What unit is used to measure area in this chapter?
The unit used is square centimeters (square cm).
What is the area of Piece A if its length is 6 cm and width is 5 cm?
The area of Piece A is 30 square cm (6 cm * 5 cm).
How did Parth and Gini initially try to compare their mango slices?
They looked at their dried mango slices and couldn't easily tell whose piece was bigger.
What method is suggested to find out whose piece is bigger?
Using small squares to measure and compare the area of the pieces.
Related resources
Important topics
Topics covered
NCERT Class 5 Mathematics — Math-Magic — Chapter 11 — cm. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.